Door and door-frame for ovens, retorts, and the like



A. H. LYMN ZflfififiSl DOOR AND DOORFRAME FOR OVENS, RETORTS AND THE LIKE Filed Oct. 5, 1935 3 Sheets-Sheet l INL/E/VTOR. Ari/7w" Henry Lymfl. @Y M? W A T TOR/KEYS.

April 2H; 19% A, H, WAN magma DOOR AND DOORFRAME FOR OVENS, RETORTS AND THE LIKE Filed 0st. 5, 1935 s Sheets-Sheet? INVENTOR. Arihw Hen/y Lymn.

'- Q V M A TTOR/f/EYS A, H. LYMN DOOR AND DOORFRAME FOR OVENS, RETORTS AND THE LIKE Filed Oct. 3, 1935 s Sheets-Sheet 3 INVENTOR ArfhurHenry Lymn. BY QY/V'M M Patented Apr. 21, 1936 i U I TED FiSLTATES NT OF Fl C E DOOR: AND'"DOOR-FR'AME FOR OVENS, "BET-OBITS; AND 'THE LIKE -:Arthur HenryLymn, London, England Application October 3,1935, Serial No. 43,395

-In Great Britain October 4, 1934 14' Claims. (CL. 202.-248) This invention relates to doors and door frames for ovens, retorts and other apparatus for the carbonization; distillation; or like heat treatment of coal and other carbonaceous materials.

In horizontal coke ovens, it has been proposed to use a closure consisting of a rigid metal door frame coacting with a metal door provided with two flexible seals. Such closures, however are subject to certain drawbacks. Thus for instance, the inside of the inner seal is subjected to the action of the tar-laden distillation products and tar is deposited on the sealing surfaces of the frame and door with the result that on the withdrawal of the door and itssubsequent replacement, this tar deposit tends to prevent the inner seal making a substantially gas tight joint. Moreover, as is'known, the maximum gas pressure is exerted at the bottom ofthe door and the pressure decreases towards the top of the door. As it is difficult, if not impossible, in practice to keep the inner seal gas tight,.'the gas leakage which takes place past this seal exerts pressure 30 on and has to be stopped by'the. outer seal with a consequent fouling of the sealingsurfaces of the latter, thus entailing the labour of cleaning the said surfaces.

The present invention aims at obviating the 5-35 foregoing disadvantages.

Accordingly, one object of the invention isto provide a door having two or more flexible seals the inner of which is so arranged as to scrape and clean the inner sealing surface" of the door 340 frame.

A'further object of the invention is to provide an outer metal-to-metal .seal between the door and the door-frame which comprises aflexible plate secured to and surrounding the. door body A further object of the invention is to provide an-innerseal'ror sealsconsisting'of a dished,

it is not in any way limited to such application.

and carrying a packing frame of known type, ar-

1 flexible and adjustable metal plate orvplates arranged to bear against an inclined surface or surfaces on the door-frame, whilst the outer seal consists of an asbestos or like packing mounted at the'end of an adjustable flexible plate and arranged to bearagainst the door-frame face.

Still a further object of the invention is to provide a closure of the foregoing general type "having tightening means operable in common by a single operating mechanism, in a simple and-efficient manner.

Further objects and advantages of the invention will become apparent as the description thereof proceeds.

In order more clearly to understand the invention, reference is made to the accompanying drawings which illustrate by Way of example,

of-Fig. 1;

' Fig. 3 is a view on a larger scale of a detail of F i Fig. 4 is a transverse section through the middle' of Fig. 1;

Fig. 5 is a plan section of a second embodiment;

Fig. 6 is a detail showing an alternative sealing arrangement;

Fig. 7 is a plan section of still another embodiment; Whilst Fig. 8 is adetail on a larger scale of part of i the coke-oven door of Fig. 7.

' In .all the figures like parts are denoted by like characters of reference.

In the embodiment illustrated in Figs. 1 to 4, l denotes the door-frame which is held in position in theoven brickwork by means of buckstays 2. I

The door,yfltting into the door-frame I, is built up'of sections and comprises two vertical steel .joists 4; 4 suitably braced. Said joists 4 may obviously be replaced by girders of U or channel section or by castings if desired.

.The outer. or main seal of the door is constituted by a-flexible mild steel plate 5 secured to the webs of the joists 4 and adapted to bear on the partrla of the door-frame I.

.Bolted or otherwise secured to each plate 5 is an angle bar 5a which bears against the seating surface Ia.

Alternatively. the plate may be flanged all round with theedge of the flange bearing against the seating surface la.

An inner seal is formed by laminated flexible steel plates 6 mounted between the rear flanges 4b of the joists and a plate ll! forming part of the door. The flexible steel plates 6 are so disposed that on closing the door the inner plates of each assemblage scrape and clean the sealing surface lb of the door-frame whilst the outer plate or plates, which do not come into contact with the tar-laden vapours and are consequently substantially clean, make a substantially gas-tight joint with the cleaned sealing surface lb. Moreover the laminated plates 5 assembled together in the manner more clearly shown in Fig. 3 are able to adjust themselves individually to any inequalities in the sealing surface lb and thus enhance the gas tightness of the inner seal.

The outer surface of the outermost, and if de sired the outer surface of one or more of the remaining flexible plates 5 of each assemblage may be covered with heat-insulating material whereby condensation and deposition of tarry matters on the plates 6 can be reduced to a minimum.

Bolted on the plate 55 are lugs ll which are each provided with set screws 52 adapted to adjust the pressures with which the periphery of the flexible members t bears against the oblique rear edges lb of the door-frame.

Secured to the front flanges 4a of the joists are a series of bridge members M which are provided at their ends with bosses through which pass set screws l3 adapted to bear on the periphery of the flexible plate 5 to adjust the pressures with which it bears against the surfaces la of the door-frame I so as to allow for any inequalities caused by warping of the door-frame.

Between joists i are angle plates 2| securing blocks 26 which house a screw 22 on which is mounted a locking bar 23 adapted to engage behind plates 26 mounted on the buckstays 2 to thrust on the whole door when it is locked. The individual screws 22 are provided with a squared end 23 so as to enable them to be operated by a spanner to adjust the thrust of the locking bars. The various locking bars 23 (two in general, of which only one is shown in Figs. 1 to 3) are inter-connected by means of an operating rod 25 so that all looking bars 23 are operated together. On an upward pull of the rod 25, the locking bar 23 enters into the position shown in dotted lines in Fig. 1 and is thus no longer held by the plates 24, thereby allowing the door to be opened.

The door jambs or flash plates right round the door opening I are tapered inwards at their rear end and the flexible sealing member 5 is continued all round the door so that the seal is complete. Similarly the flexible laminated plates 6 are dished all round the door.

Secured to the plate IE! and rear flanges 4b of the joists by brackets l are cast iron boxes or holders 8 containing a refractory lining 9 exposed to the heat of the oven. This arrangement ensures a flexible structure which cannot crack if warping should take place and which can easily be straightened.

Moreover, the provision of the brackets 7 causes a space 26 to be formed between the box 3 and the plate l0 through which the gas generated at the bottom of the ovens can pass freely from the bottom of the ovens to the top of the coal charge inside the inner seal 6 in the door itself.

In the embodiment illustrated in Fig. 5, the inner seal is formed by the flexible steel plate 6 which is mounted at the rear of the plate I 0 forming a part of the door and the periphery of which bears against the inclined surfaces lb of the frame I. The outer seal is likewise formed of a flexible flanged steel plate 49 which is bolted to the webs of the channels 4 of the door, the periphery thereof likewise bearing against the inclined surfaces lb. Lugs 4| adjustable in a horizontal direction are carried on screwed spindles 42 by means of which the flexible steel plates forming the outer seal are adjusted to allow for any inequalities caused by warping of the door frame I.

The coke oven door is provided, as in the case of the previous embodiment, with a series of looking bars is interconnected by an operating rod, one of said locking bars being shown and which is adapted to engage behind retaining members 43, so as to thrust on the door when it is locked.

Secured to the plate It and the main door channel member by brackets are cast iron boxes or holders 8 containing a refractory lining 9, which is exposed to the heat of the oven in the manner described in the foregoing embodiment th spacing between the box 8 and plate It] enabling the gas generated at the bottom of the oven to pass freely to the top of the coal charge in the door itself inside the inner seal 6.

In the embodiment shown in Fig. 6, the inner seal 6 is similar to that described with reference to the foregoing embodiment in that the outer periphery of the seal bears against the inclined surfaces of the door frame lb. The seal 6 is however, secured to the webs of the channels by means of bolts M in slotted holes which allow for some adjustment of the inner seal t in a horizontal direction.

The outer seal consists of a flexible plate 5 flanged at its inner side and attached to the webs of the channel members of the door. At the outer edge of the flexible plate 5, asbestos packing 45 is carried in a slot formed by a metal strip 66 and angle fill attached to the flexible plate.

Adjustment of the outer seal is carried out by means of set screws 48 in the brackets 49 which are likewise attached to the channel member of the door, the set screws 48 being adapted to bear on and press the extremity of the flexible plate 5, thus forcing the projecting asbestos packing 55 against the face of the door frame.

In order to allow for wear of said asbestos packing 5b, the set screws 23 are turned down at the ends 50 which pass through holes in the flexible plate 5 to bear on a metal strip 5! placed in the box behind the asbestos, packing. Thin washers 52 are placed on the ends of the set screws 43 between their shoulders and the flexible plate 5 and when the asbestos packing 45 needs adjustment one or more of these washers is removed, thus allowing the reduced ends of the set screws to bear on the metal strip 5| and thus force the asbestos packing #5 forward.

In the embodiment of coke oven door illustrated in Figs. 7 and 8, the inner seal 6 is substantially similar to the seal 6 of Fig. 6, but the outer seal 5 is adapted to be adjusted either by pressing it against the door frame I, or by pulling it in an outward direction.

Moreover, the outer seal itself is constituted by a packing 52 of asbestos which is bolted on to an angle 53 and thus secured at right angles.

to the flexible plate 5 and can be brought to bear against the edge of the door frame I. The flexible plate 5 is flanged at its inner side and bolted to the channel members l of the door. Adjusting of the seal is effected by means of threaded- 1: -eye; bolts: 5.4.passing'2 through .righteangled brack- -.,ets;55. also; attached totthe channel 4, the eyes .155 fitting into lugs' orv cups 5'! which latter are attachedto theflexibletplate 5. Itiwill thusbe 5;,.-:--.seen thatsaid plate .5 can. betpushed towardsor mpulled=away-from door frame -I by screwingup orunscrewing the eye boltsi54.

The asbestos packing- 52 is arranged tov project 1:: beyond the. flangeioflthe angle 53 to which it is p: attached, since the asbestostconforms moreclosely .1 more easily than metal to: any irregularities intheicoeacting metal sealing surface and can ;be EadjllStEd in. known .manner, for example by providingslotted holes in the angle 53, in order :z loitdcompensate forthe deterioration or wear'of .c-saidi asbestos which may occur.

a .The foregoing constructions are equally advan- .:.tageous in casesiwhere the seals are made on an :sauxiliary :renewabledoor-frame thoroughly in- :r sulated. from, andmechanically attached to the :imain door-frame so-that it does not partake 'of the distortion of the latter.

.ziIn the. embodimentillustrated in Fig. 6, the door frame I is represented as being of the type which is adapted to be renewed, and is thoroughly insulated from, and mechanically attached to the main door frame so that it does not partake of the distortion of the latter.

It should be well understood that the embodiments hereinbefore described are given purely by way of example and are not intended in any way to limit the scope of the invention which is intended to be covered in its broadest aspects by the appended claims.

I claimll. A closure for apparatus, such as coke ovens and retorts, operating at elevated temperatures, said closure comprising a rigid metal door-frame and a metal door, a metal plate secured to said door and bearing on a part of the door-frame to form an outer seal and a plurality of flexible metal plates secured together at one edge and gearing with their other ends on an inner part of said door-frame to form an inner seal.

2. A closure for apparatus, such as coke ovens and retorts, operating at elevated temperatures, said closure comprising a rigid metal door-frame and a metal door, a metal plate secured to said door and bearing on a part of the door-frame to form an outer seal, and an inner seal consisting of a plurality of flexible metal plates secured together at one edge and bearing with their other ends on an inner part of said door-frame so as to adjust themselves individually to any inequalities in said door frame. 7

3. In a coke oven, a stationary door-frame, a door body, abutting sealing surfaces on said doorframe and said door body, an outer elastic sealing plate arranged on said door body adapted to engage with a sealing surface on said doorframe, a plurality of inner elastic sealing plates arranged on said door body behind said outer sealing plate and adapted to engage with an inner sealing surface of the door frame, and a covering of heat insulating material on the outer surface of at least one of said inner elastic sealing plates.

4. A closure for apparatus, such as coke ovens ing barsmounted on. the a main: doorrstructure, :11 means: for: coupling .saidr -slocking. bars: together, meanslzfor adjustingthebearing pressure of;each locking czbar. andLmeans operativelyei. inter-econcn'ecting said adjusting means.

5. A closure for apparatus; such ascoke ovens .11 and retorts, operating at elevated 1 temperatures, said closure comprising a rigid metal door-frame :...and a. metal door, ametalplate secured-to said door/ andbearing on a part of-the door -frameto mformuan outer seal, a plurality of flexible metal plates' secured together at one edge. and-bearing --"withotheir other ends on an inne-r spartwf said J .door frame to form an inner seal, rotatabledockscrew spindle passing through each lock-ingtbar 1.. and screwed into-the door structure; tightening .nut on eachscrew spindle, and means operatively interconnecting-the screw spindles on the several locking bars. J 6- A closure for apparatussuch as coke 'ovens orretorts operating at elevated temperatures, said closurecomprising a rigid metal door frame and a metal door having an outer dished flexible and adjustable metal plate bearing on an inclined surface on the door frame and an inner dished flexible plate bearing on another inclined portion of the door frame.

7. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer dished flexible plate adjustable by lugs loosely mounted on threaded spindles and bearing on an inclined surface on the door frame and an inner dished flexible plate bearing on another inclined portion of the door frame.

8. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer dished flexible plate adjustable by lugs loosely mounted on threaded spindles and bearing on an inclined ingbars mounted onthe main door structure, a.

surface on the door frame and an inner dished flexible plate bearing on another inclined portion of the door frame and adjustable by means of bolts in slotted holes in the door structure.

9. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer seal with a packing of fibrous material mounted round the outside edge of an adjustable flexible plate and arranged to bear against the door-frame face and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

10. A closure for apparatus such as coke ovens or retorts operated at elevated temperatures, said closure comprising a. rigid metal door frame and a metal door having an outer seal with a packing of asbestos mounted round the outside edge of an adjustable flexible plate and arranged to bear against the door-frame face and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

11. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer seal with a packing of fibrous material mounted round the outside edge of a flexible plate and arranged to bear against the door-frame face with a pressure which is adjustable by means of set screws and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

12. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer seal with a packing of fibrous material mounted round the outside edge of a flexible plate which is arranged to bear against the door-frame face the pressure being controlled by eye-bolts co-acting with the outer seal and arranged to exert pull as well as pressure, and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

13. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer seal with a packing of asbestos mounted between metal strips round the outside edge of an adjustable flexible plate and adjustable relative to said strips, said packing being arranged to bear against the doorframe face and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

14. A closure for apparatus such as coke ovens or retorts operating at elevated temperatures, said closure comprising a rigid metal door frame and a metal door having an outer seal with a packing of asbestos mounted between metal strips round the outside edge of an adjustable flexible plate and adjustable relative to said strips by means of set screws arranged in the rear of said asbestos, said packing being arranged to bear against the door-frame face and an inner seal consisting of dished flexible and adjustable metal plates fixed to the door and arranged to bear against an inclined surface or surfaces on the door frame.

ARTHUR HENRY LYMN.

CERTIFICATE OF CORRECTION.

Patent No. 2,038,051. April 21, 1936.

ARTHUR HENRY LYMN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 4-5, claim 1, for the word "gearing" read bearing; and second column, line 60, laim 10, for "operated" read operating; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25rd day of June, A. D. 1936.

Leslie Frazer Acting Commissioner of Patents. 

